package com.qk.interceptor;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

@Component
@Slf4j
public class TokenInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //1. 获取请求路径
        String uri = request.getRequestURI();

        //2. 判断请求路径是否为登录请求，如果是，放行
        if (uri.contains("/login")){//登录请求
            log.info("登录请求{},放行", uri);
            return  true;
        }

        //3.获取请求头中的token
        String jwt = request.getHeader("token");

        //4.判断token是否存在，如果不存在，响应401状态码
        if (jwt == null|| jwt.isBlank()){
            log.info("请求头中没有token");
            response.setStatus(401);
            return  false;
        }

        //5.解析令牌，如果解析失败，响应401状态码
        try{
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);
            log.info("当前用户为id:{}，存入ThreadLocal中", userId);
            CurrentUserHoler.setCurrentUser(userId);

        } catch (Exception e) {
            log.info("令牌解析失败，{}",e.getMessage());
            response.setStatus(401);
            return  false;
        }

        //6.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        log.info("删除ThreadLocal中的登录用户信息");
        CurrentUserHoler.removeCurrentUser();
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
